The reason there’s so much hype around cloud computing is the promise that it will reduce infrastructure costs while providing compute and storage capacity on demand. But, of course, moving to cloud computing doesn’t necessarily guarantee cost savings. In the latest reminder of that dichotomy, a survey of 1,300 businesses in the United States and United Kingdom released last week by Rackspace showed that 66 percent found cloud computing has reduced their IT costs, while 17 percent said it failed to do so.

The remainder had no opinion. Yet another survey commissioned by Internap, which runs 12 datacenters throughout the United States, primarily for colocation but also for its cloud computing business, suggests that of the 65 percent who said they are considering the use of cloud services, 41 percent expect them to reduce their costs.

This obviously isn’t an apples-to-apples comparison since, among other variations, the Rackspace study surveyed those who already use cloud services while the Internap survey didn’t query only those running apps in the cloud. But the two surveys offer some interesting data points on the role costs play in determining the value of using cloud computing services.

“It used to be debatable whether the cloud was saving money or not, but apparently the businesses we surveyed believe it is saving them money,” said Rackspace CTO John Engates in an interview last week.

But depending on your application, cloud computing can actually cost more, warned Raj Dutt, senior VP of technology at Internap. That’s especially the case for applications that have consistent and predictable compute and storage usage, he explained.

“People move to the cloud for perceived cost savings and what we’re finding is it gets really expensive compared to colocation, [particularly] if you look at the three-year overall total cost of ownership of an application that is pretty constant,” Dutt said.

The cynic in me says, “Of course, Rackspace is going to share data that finds cloud computing reduces IT costs, and why wouldn’t a colocation provider want to deliver numbers that show the benefits of running your own gear in offsite facilities, even if it has a cloud business as well?” But what these two surveys have in common is they both put forth a healthy long-term prognosis for cloud computing. Indeed, Engates pointed out that Rackspace uses the colocation facilities of Equinix.

While nearly two-thirds of those surveyed by Internap are considering cloud services, the company didn’t ask if they were already using them. Nonetheless, 57 percent said they were considering hybrid IT infrastructure services, which Dutt said bodes well for the future use of colocation facilities since customers would likely cloud-enable or extend the apps already running in those facilities to Infrastructure as a Service (IaaS) providers.

“What Internap is interested in doing is bringing a lot of the cloud capabilities like remote insight management, APIs, even the ability to control your infrastructure programmatically remotely without having to call the datacenter or send someone to fix your problem in your rack,” Dutt said. “We’re able to provide the service delivery promise that the cloud offers into the ‘colo’ world where no one is expecting it, and we’re able to do it under a single pane of glass [from a] single vendor and allow you to build your app on the building block that best makes sense for you.”

From the Rackspace survey, of those already using cloud computing:

The largest sample, 41 percent, said cloud computing reduced costs from 10 to 25 percent, while 19 percent said it providing 25 to 50 percent in IT savings, and 27 percent said it only cut costs by 10 percent or less.

54 percent said use of cloud services helped accelerate IT project implementation, including application development, while 17 percent begged to differ. The rest weren’t sure.